A consumer rights group in the US has urged Tesla to disable the automatic steering function on its Autopilot system.
It follows at least two crashes, one fatal, in which the system was active.
Consumer Reports accused Tesla of an "aggressive rollout of self-driving technology".
Tesla described it as "well-meaning advice", adding: "We make our decisions on the basis of real-world data."
In a statement, the firm said: "Tesla is constantly introducing enhancements proven over millions of miles of internal testing to ensure that drivers supported by Autopilot remain safer than those operating without assistance.